This made with three concentric spheres:

* The innermost sphere has a radius of 6000 units and has the land and 
ocean texture.

* The middle sphere has a radius of 6009 units, textured with a granite 
map that is highly perturbed (lambda = 4).  The color map is clear to 
.66, fading to full white at .67.

* The outermost sphere has a radius of 6010 units and is transparent 
with a scattering media in the interior.

The scattering media and the clouds texture do a fair job of hiding the 
lameness of the land texturing.

Regards,
John

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